JPH0719465B2 - Disco Cartridge - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention rotatably accommodates a disk such as a magnetic disk in a synthetic resin cartridge case including an upper case and a lower case, and The present invention relates to a disk cartridge having a cleaning sheet for cleaning a disk fixed to each inner surface of the lower case, and particularly to a support structure for the cleaning sheet.

[Conventional technology]

A flexible disc cartridge containing a magnetic disc in a case made of a soft material such as polyvinyl chloride sheet has been known in the past, but it bends or bends during handling or storage. Therefore, there is a drawback that the contact state between the magnetic disk and the magnetic head is deteriorated and the recording / reproducing characteristics are deteriorated.

Therefore, in recent years, a disk cartridge has been provided in which a magnetic disk is rotatably housed in a cartridge case formed of a hard synthetic resin such as ABS resin.

FIG. 9 is a cross-sectional view showing a conventional example of a disk cartridge which uses a hard case of this type. 1 is a cartridge case, 2 and 3 are cleaning sheets, and 7 is a magnetic disk. Cartridge case 1 is made by joining and integrating upper case 4 and lower case 5 made of a hard synthetic resin such as ABS resin by ultrasonic welding or the like, and recording / reproducing at the center position of each case 4 or 5. Aperture 4 into which the drive shaft of the device is inserted
Magnetic head insertion openings are formed in a and 5a, and at predetermined positions (not shown). In this cartridge case 1,
A thin-film magnetic disk 7 having magnetic layers formed on both sides is rotatably accommodated, and a hub 6 having an insertion hole 6a into which the tip of the drive shaft is inserted is fixed to the central portion of the magnetic disk 7. Has been done. The cleaning sheets 2 and 3 are made of non-woven fabric such as rayon fiber, and are fixed to the upper and lower cases 4 and 5 except the openings 4a and 5a and the magnetic head insertion port by adhesion or heat fusion. It comes into contact with the surface of 7. Therefore, when the magnetic disk 7 is rotated when the disk cartridge is used, the surface of the magnetic disk 7 can be cleanly cleaned by the cleaning sheets 2 and 3, and troubles due to adhesion of dust and the like can be eliminated. it can.

[Problems to be solved by the invention]

By the way, in the disk cartridge having the conventional hard case configured as described above, the deformation like the flexible disk cartridge described above does not occur, but it is not without problems. That is, since the cartridge case is made of a hard synthetic resin molded body, a gap is inevitably formed between the thin film magnetic disk and the cartridge case, and the cleaning sheet is fixed to the inner surface of the cartridge case. However, there are cases where the contact with the magnetic disk is incomplete or there is no contact at all. Therefore, the cleaning effect on the magnetic disk is hardly exerted, and dusts adhere to the surface of the magnetic disk, which enter the headgear of the magnetic head and cause deterioration of recording / reproducing characteristics.

Conventionally, as described in JP-A-59-30273, ribs are provided on the inner surfaces of the upper case and the lower case, and the cleaning sheet stuck to the inner surface of the case is partially lifted by the ribs to partially lift the magnetic disk. A disk cartridge that is brought into contact with and cleaned is proposed.

However, in this disk cartridge, the height of the rib and the thickness of the cleaning sheet are not taken into consideration, and the disk sandwiched by the rib on the upper case side and the rib on the lower case side via the cleaning sheet. Is wavy. Therefore, the rotation torque of the disk is large, the disk and the cleaning sheet are heavily worn, and if left in the above-mentioned state, the disk is partially deformed and the contact with the magnetic head becomes poor. Atsuta

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a disk cartridge capable of reliably exerting a cleaning effect on the disk.

[Means for solving problems]

The above-mentioned object of the present invention is to attach and integrate a synthetic resin upper case and a lower case to each other, a cleaning sheet fixed to the inner surfaces of the upper case and the lower case, and the inside of the cartridge case. A disk cartridge having a thin film-shaped flexible disk housed rotatably in the disk cartridge.

Then, ribs are provided on the inner surfaces of the upper case and the lower case, respectively, so that they do not face each other when the upper case and the lower case are joined, and the ribs partially lift the cleaning sheet. It is characterized in that the cleaning sheet is partially brought into contact with the disk by the side ribs and the lower case side ribs while the disk is substantially flat.

[Action]

As described above, according to the present invention, since the cleaning sheet is partially brought into contact with the ribs by the ribs as described above, the rotation torque of the disk is smaller than that of the conventionally proposed one, and therefore the disk is In addition, the cleaning sheet is less worn, the disk is not partially deformed during storage, and the contact with the magnetic head is good.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

1 is a plan view of a disk cart sleeve according to an embodiment of the present invention, FIG. 2 is a bottom view of an upper case, FIG. 3 is an enlarged sectional view taken along the line AA of FIG. 2, and FIG. The figure shows a bottom view showing a state where the cleaning sheet is attached to the upper case, FIG. 5 is a plan view of the lower case, FIG. 6 is a plan view showing the state where the cleaning sheet is attached to the lower case, and FIG. 7 is a disk car. FIG. 8 is a cross-sectional view showing a joining state in the vicinity of the magnetic head insertion opening of the cartridge, and FIG. 8 is a cross-sectional view of the main part of the disk cartridge cartridge, and the members corresponding to those in FIG. 9 are designated by the same reference numerals.

The disk cartridge is mainly composed of the cartridge case 1 and the magnetic disk 7 rotatably housed therein, as in the conventional example described above. As shown in FIG. 1, a recording area 7a in which data is magnetically recorded is formed in a predetermined area on the magnetic disk 7.

The cartridge case 1 is formed by joining and integrating an upper case 4 and a lower case 5, and these are formed of a hard synthetic resin such as styrene resin.

As shown in FIG. 2, a circular opening 4a is formed substantially in the center of the upper case 4, and a rectangular magnetic head insertion opening 8 is formed outside the opening 4a. The opening 4a and the magnetic head insertion port 8 are located in a recess 4b formed in a stepped shape on the upper surface of the upper case 4. Therefore, when a magnetic head (not shown) is loaded in the magnetic head insertion opening 8,
The amount of movement of the magnetic head is reduced as much as possible by the recess 4b, and lateral shake of the magnetic head can be prevented. Reference numeral 18 denotes a reference surface portion that is recessed in a stepped shape from the surface of the upper case 4 (and the lower case 5 described later).
Since the reference surface portion 18 is thus formed in the concave surface,
When the disc cartridge is loaded in the recording / reproducing apparatus, it is possible to prevent the reference surface portion 18 from sliding unnecessarily, and the accuracy of the reference surface is maintained for a long time.

On the inner surface of the upper case 4, a plurality of first linear ribs 9 radially extending outward from the opening 4a extend beyond the recording area 7a of the magnetic disk 7, and as shown in FIG. First linear ribs 9 of the book are formed so as to be arranged at intervals of 90 degrees including the magnetic head insertion ports 8. Further, in the portion excluding the magnetic head insertion port 8 and its periphery, one or more first arc-shaped ribs 10 having a height slightly lower than that of the first linear ribs 9 are formed substantially concentrically with the opening 4a,
Preferably, a plurality of them are formed. Furthermore, upper case 4
A plurality of bosses 11 and one projecting wall 12 for fusion bonding to a lower case, which will be described later, are provided upright on the inner peripheral edge of the. The projecting wall 12 is located in the vicinity of the magnetic head insertion port 8 and has a mountain-shaped fusion-bonding margin 12a at its tip as shown in FIG.

As shown in FIG. 4, the cleaning sheet 2 is fixed to the inner surface of the upper case 4 thus configured so as to cover the first linear rib 9 and the first arc-shaped rib 10.
A notch 2a for exposing the magnetic head insertion port 8 is formed in a part thereof. This cleaning sheet 2
Is made of, for example, rayon-polyester mixed paper or synthetic fiber non-woven fabric, and its peripheral portion is partially heat-sealed to the upper case 4 as shown by dots in the figure.

On the other hand, as shown in FIG. 5, the lower case 5 is also provided with an opening 5a and a magnetic head insertion opening 17 corresponding to the upper case 4. On the inner surface of the lower case 5, one or more second linear ribs 13 extending radially outward from the opening 5a at least over the recording area 7a of the magnetic disk 7, preferably as shown in the drawing. Two linear ribs 13 are formed so as to be located substantially at the center of the first linear rib 9 of the upper case 4. A second arcuate rib 14 having a height slightly lower than that of the second linear rib 13 is formed substantially concentrically with the opening 5a in the inner surface of the lower case 5 except the magnetic head insertion hole 17 and its periphery. One or more, preferably a plurality, are formed. The second linear ribs 14 are formed so as to be located substantially in the center between both the first arc-shaped ribs 10 of the upper case 4 described above and between the inner first arc-shaped ribs 10 and the opening 4a. There is.

Further, a plurality of receiving portions 15 and one projecting wall 16 that allow the insertion of the bosses 11 of the upper case 4 are provided upright on the inner peripheral edge of the lower case 5. Of these receiving portions 15, the inner diameters of the receiving portions 15 (hereinafter referred to as 15a) located at the corners at the left and right lower ends of the center of FIG. 5 are set to be substantially the same as the outer diameter of the boss 11,
Further, the two receiving portions 15 at the upper end (hereinafter referred to as 15b) are vertically elongated in the figure, and other receiving portions 15 are provided.
Is formed in a cylindrical shape having an insertion hole somewhat larger than the outer diameter of the boss 11.

As shown in FIG. 6, the cleaning sheet 3 having a cutout portion 3a partially exposes the magnetic head insertion opening 17 and the second linear rib on the inner surface of the lower case 5 thus configured. 13 and the second arc-shaped rib 14 are placed so as to respectively cover the peripheral portions of the ribs 13 and the second case ribs 14 are partially heat-sealed to the lower case 5.

The upper and lower cases 4 and 5 to which the cleaning sheets 2 and 3 are fixed as described above are integrated by ultrasonic vibration with the magnetic disk 7 being sandwiched between them. At this time, the cases 4 and 5 are provided with the two bosses 11 located at their lower corners.
Since the receiving portion 15a and the receiving portion 15a serve as reference positions, and the two bosses 11 and the vertically long receiving portion 15b located above them serve as escape portions, the positioning is performed with high accuracy. Then, the abutting surfaces of the respective bosses 11 and the receiving portions 15 positioned in this way, and the protruding walls 1
When the abutting surfaces of the two and 16 are ultrasonically fused, the two cases 4 and 5 are joined and integrated at their peripheral portions. In particular, as shown in FIG. 7, in the upper portions of the magnetic head insertion ports 8 and 17 which are thinner and weaker in strength than the other portions, as shown in FIG.
Melts and solidifies the two protruding walls 12 and 16 firmly, so that these protruding walls 12 and 16 function as reinforcing ribs.

When the upper case 4 and the lower case 5 are joined and integrated in this way, both the cleaning sheets 2 and 3 come into contact with the surface of the magnetic disk 7 housed therein. In this case, the 8th
As shown in the figure, the cleaning sheets 2 and 3 are arranged on the magnetic disk 7 at the positions where the first and second linear ribs 9 and 13 radially extend from the openings 4a and 5a of the upper and lower cases 4 and 5, respectively. Although it is elastically pressed against the magnetic disk 7, the magnetic disk 7 is in a substantially flat state. Since the first and second linear ribs 9 and 13 are arranged in a staggered manner at predetermined intervals in the circumferential direction (rotational direction) of the magnetic disk 7, the magnetic disk 7 is used when the disk cartridge is used. When is rotated, the cleaning sheets 2 and 3 and the magnetic disk 7 are elastically brought into sliding contact with each other at the portions of the linear ribs 9 and 13 due to the flexibility of the magnetic disk 7. As a result, the surface of the magnetic disk 7 is cleanly cleaned by the cleaning sheets 2 and 3, and troubles due to the adhesion of dust and the like are reliably eliminated. Moreover, in this embodiment, the first and second arc-shaped ribs 10 and 14 which are slightly lower in height than the linear ribs 9 and 13 are provided alternately at a predetermined interval in the radial direction of the magnetic disk 7. Therefore, the arcuate ribs 10 and 14 prevent the magnetic disk 7 from moving up and down, realize stable rotation of the magnetic disk 7, and allow good magnetic recording and reproduction.

In the above-described embodiment, one of the three linear ribs 9 is located at the center of the magnetic head insertion opening 8 at 180 degrees, and the other two are located at the magnetic head insertion opening 8 and the first straight line facing the magnetic head insertion opening 8. Since it is provided almost in the middle of the ribs 9, the pressure contact force from the magnetic heads (not shown) at the magnetic head insertion ports 8 and 17 is applied to the rotating magnetic disk 7 at the first linear ribs 9 as described above. As described above, the pressing force from the cleaning sheet 2 acts at equal intervals of about 90 degrees, so that the external stress acting on the magnetic disk 7 can be made uniform and the deformation of the magnetic disk 7 can be suppressed.

In the above embodiment, the first linear rib 9 is attached to the upper case 4
Although the case where the second linear rib 13 is provided in the lower case 5 has been described above, it goes without saying that the same effect can be obtained even if these relationships are reversed.

Further, the number of the first and second linear ribs 9 and 13 is not limited to that in the above-mentioned embodiment, and the point is that these are arranged alternately at a predetermined interval in the circumferential direction of the magnetic disk 7. It should be provided on the lower cases 4 and 5.

Further, in the above embodiment, the first and second linear ribs 9,
The case where 13 is radially extended from the openings 4a and 5a has been described. However, these do not necessarily have to be linear or extend radially, and the point is to cross the recording area 7a of the magnetic disk 7. It should be formed.

〔The invention's effect〕

As described above, according to the present invention, since the cleaning sheet is partially brought into contact with the disk by the ribs in a substantially flat state, the rotating torque of the disk is small, and therefore the abrasion of the disk and the cleaning sheet is caused. And the disk does not partially deform during storage, and the contact with the magnetic head is good.

Further, as in the above-described embodiment, the ribs are provided so as to extend from the inner side to the outer side across the recording area of the disk, and the distance between the ribs on the inner side of the recording area is narrower than the distance on the outer side of the recording area. If this is done, cleaning on the inner side of the recording area of the disk is particularly effective.

The recording density on the inner side of the disk recording area is higher than that on the outer side of the recording area, and therefore errors are more likely to occur. The feature is that the occurrence of the recording is less and high recording density is possible.

[Brief description of drawings]

1 to 8 relate to an embodiment of the present invention. FIG. 1 is a plan view of a disk cartridge, FIG. 2 is a bottom view of an upper case, and FIG. 3 is a line AA in FIG. Enlarged sectional view along
FIG. 4 is a bottom view showing the upper case with the cleaning sheet attached, FIG. 5 is a bottom view of the lower case, FIG. 6 is a plan view showing the state with the cleaning sheet attached to the lower case, and FIG. FIG. 8 is a cross-sectional view showing a joined state in the vicinity of the magnetic head insertion opening of the disk cartridge, FIG. 8 is a cross-sectional view of a main part of the disk cartridge, and FIG. 9 is a schematic cross-sectional view of a conventional disk cartridge. 1 ... Cartridge case, 2, 3 ... Cleaning sheet, 4 ... Top case, 4a ... Opening, 5 ... Bottom case, 5a
...... Aperture, 7 ...... Magnetic disk, 7a ...... Recording area, 8,17
...... Magnetic head insertion port, 9 ... First linear rib, 10 ...
... first arc-shaped rib, 13 ... second linear rib, 14 ... second arc-shaped rib.

Claims (2)

[Claims] 1. A cartridge case in which an upper case and a lower case made of synthetic resin are joined and integrated, a cleaning sheet fixed to the inner surfaces of the upper case and the lower case, and rotatable inside the cartridge case. In a disk cartridge having a thin film flexible disk housed in, a rib is provided on the inner surfaces of the upper case and the lower case so as not to face each other when the upper case and the lower case are joined. The cleaning sheet is partially shifted by the ribs, and the cleaning sheet is partially lifted by the ribs, and the cleaning sheet is partially brought into contact with the disk while the disk is substantially flat by the ribs on the upper case side and the lower case side. Disc Cartridge which features that. 2. In the claim (1),
The ribs are provided so as to extend from the inner side to the outer side across the recording area of the disk, and the distance between the ribs on the inner side of the recording area is narrower than the distance on the outer side of the recording area. Disk Cartridge that does.